IDY10220 SECURITE High Seas Forecast for Western METAREA 10 12S TO 30S BETWEEN 90E AND 125E, AND 30S TO 50S BETWEEN 80E AND 129E Issued by the Australian Government Bureau of Meteorology For 24 hours commencing 2300 UTC 18 November 2025 Part 1 Warnings Refer to latest warnings for details of the area affected. Nil. Part 2 Situation at 181800 UTC Trough [1] 24S106E to low [1] 1005hPa near 29S114E. Forecast near 28S112E 30S115E to low now over mainland Australia at 191200UTC, then trough moving over the mainland. Cold front [1] 36S091E to low [2] 1009hPa near 47S098E. Forecast low [2] 1007hPa near 50S101E at 190600hPa and then moving south of area. Forecast cold front [1] near 46S103E 50S109E at 200000UTC. Cold front [2] 39S083E to low [3] 1004hPa near 45S085E. Forecast 32S080E 40S089E to low [3] 1003hPa near 47S091E at 200000UTC. Part 3 Forecast Refer to latest warnings for boundary of affected area and type of weather system. South of line 47S129E 50S123E,: Southwesterly quarter winds 25/33 knots. Rough to very rough seas. Moderate to heavy swell. Within 300nm north of line 34S110E 38S115E 35S123E: Southeasterly quarter winds. Wind speeds 20/30 knots. Rough seas. Low to moderate swell. West of line 38S080E 42S084E 50S083E: Northwesterly quarter winds 25/33 knots. Moderate to rough seas. Low to moderate swell. Remainder: Winds not exceeding 25 knots. Moderate to rough seas. Low to moderate swell, increasing to moderate to heavy south of line 41S113E 32S129E. Rain areas, scattered showers and isolated thunderstorms mostly within 180nm of troughs,within 120nm of line 29S091E 39S097E 46S104E, and north of line 36S114E 35S129E. Visibility reducing below 2nm in precipitation. Please be aware Wind and wave forecasts are averages. Wind gusts can be 40 per cent stronger than the forecast, and stronger still in squalls and thunderstorms. Maximum waves can be twice the forecast height. WEATHER MELBOURNE The next routine forecast will be issued at 08:00 UTC Wednesday.